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clk2fflogic: run peepopt -formalclk before processing design 

* this attempts to rewrite clock gating patterns into a form that is
  less likely to introduce combinational loops with clk2fflogic

* can be disabled with -nopeepopt which is useful for testing
  clk2fflogic
This commit is contained in:
George Rennie 2024-08-07 09:59:44 +01:00
parent 2cb3b6e9b8
commit 236c69bed4
1 changed files with 15 additions and 0 deletions
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15
passes/sat/clk2fflogic.cc
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@ -51,6 +51,10 @@ struct Clk2fflogicPass : public Pass {
log(" -nolower\n"); log(" -nolower\n");
log(" Do not automatically run 'chformal -lower' to lower $check cells.\n"); log(" Do not automatically run 'chformal -lower' to lower $check cells.\n");
log("\n"); log("\n");
log(" -nopeepopt\n");
log(" Do not automatically run 'peepopt -formalclk' to rewrite clock patterns\n");
log(" to more formal friendly forms.\n");
log("\n");
} }
// Active-high sampled and current value of a level-triggered control signal. Initial sampled values is low/non-asserted. // Active-high sampled and current value of a level-triggered control signal. Initial sampled values is low/non-asserted.
SampledSig sample_control(Module *module, SigSpec sig, bool polarity, bool is_fine) { SampledSig sample_control(Module *module, SigSpec sig, bool polarity, bool is_fine) {
@ -121,6 +125,7 @@ struct Clk2fflogicPass : public Pass {
void execute(std::vector<std::string> args, RTLIL::Design *design) override void execute(std::vector<std::string> args, RTLIL::Design *design) override
{ {
bool flag_nolower = false; bool flag_nolower = false;
bool flag_nopeepopt = false;
log_header(design, "Executing CLK2FFLOGIC pass (convert clocked FFs to generic $ff cells).\n"); log_header(design, "Executing CLK2FFLOGIC pass (convert clocked FFs to generic $ff cells).\n");
@ -131,10 +136,20 @@ struct Clk2fflogicPass : public Pass {
flag_nolower = true; flag_nolower = true;
continue; continue;
} }
if (args[argidx] == "-nopeepopt") {
flag_nopeepopt = true;
continue;
}
break; break;
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);
if (!flag_nopeepopt) {
log_push();
Pass::call(design, "peepopt -formalclk");
log_pop();
}
bool have_check_cells = false; bool have_check_cells = false;
for (auto module : design->selected_modules()) for (auto module : design->selected_modules())